X-Git-Url: https://jxself.org/git/?a=blobdiff_plain;f=notes.adoc;h=4a166bd9eb6f8230427a8936c6807fee90c7f07f;hb=e07cedf332029369f2ce09a6f6ced3dda0de2558;hp=c41a5b645c69683b7a54133e32602d629e38d336;hpb=9e08cba63e45ed056b2c400435ba210ccb2c091f;p=open-adventure.git diff --git a/notes.adoc b/notes.adoc index c41a5b6..4a166bd 100644 --- a/notes.adoc +++ b/notes.adoc @@ -10,7 +10,7 @@ separate link:history.html[history] describing how it came to us. The principal maintainers of this code are Eric S. Raymond and Jason Ninneman. Eric received Don Woods's encouragement to update and ship the game; Jason signed on early in the process to help. The assistance -of Peje Nilson in restructuring some particularly grotty gotos is +of Peje Nilsson in restructuring some particularly grotty gotos is gratefully acknowledged. == Nomenclature == @@ -64,12 +64,12 @@ The adventure.text file is no longer required at runtime. Instead, it is compiled at build time to a source module containing C structures, which is then linked to the advent binary. -The game-save format has changed. This was done to simplify -FORTRAN-derived code that formerly implemented these functions; -without C's fread(3)/fwrite() and structs it was necessarily pretty -ugly by modern standards. Encryption and checksumming have been -discarded - it's pointless to try tamper-proofing saves when everyone -has the source code. +The game-save format has changed. This was done to simplify the +FORTRAN-derived code that formerly implemented the save/restore +functions; without C's fread(3)/fwrite() and structs it was +necessarily pretty ugly by modern standards. Encryption and +checksumming have been discarded - it's pointless to try +tamper-proofing saves when everyone has the source code. == Translation == @@ -79,7 +79,7 @@ ugly and quite unreadable. Jason Ninneman and I have moved it to what is almost, but not quite, idiomatic modern C. We refactored the right way, checking correctness -against a comprehesive test suite that we built first and verified with +against a comprehensive test suite that we built first and verified with coverage tools. This is what you are running when you do "make check". This move entailed some structural changes. The most important was @@ -101,7 +101,7 @@ in favor of proper C strings. C strings may be a weak and leaky abstraction, but this is one of the rare cases in which they are an obvious improvement over what they're displacing... -The code falls a short of being fully modern C in the following +The code falls short of being fully modern C in the following ways: * We have not attempted to translate the old code to pointer-based @@ -110,10 +110,9 @@ ways: and the choice to refrain will make forward translation into future languages easier. -* There are some gotos left that resist restructuring; all of these +* There are a few gotos left that resist restructuring; all of these are in the principal command interpreter function implementing its - state machine. One other left in the player-movement code, a two-level - loop breakout, is not reducible even in principle. + state machine. * Linked lists (for objects at a location) are implemented using an array of link indices. This is a surviving FORTRANism that is quite unlike @@ -122,7 +121,9 @@ ways: compromise forward-portability to other languages. * The code still has an unfortunately high density of magic numbers - in - particular, numeric object and room IDs. + particular, numeric object and room IDs. There are plans to fix this. + +* Much of the code still uses FORTRAN-style uppercase names. * The code is still mostly typeless, slinging around machine longs like a FORTRAN or BCPL program. Some (incomplete) effort has been made